Cam chain replacement

Hi
Could anybody be so kind and advise me how to change the cam chain as have misplaced the Haynes manual. Can I do it with the engine in the frame too? Many thanks.

You do not have to remove the engine from the frame, but you need to remove the flywheel and the magneto/generator back plate. (so will need a flywheel extractor & flywheel holding tool) & also the cylinder head and cylinder. Too involved to describe here so I suggest you buy a new Haynes manual, it is well covered in there.